ARM Cortex$-$M$4$ Programming

Each bullet point is worth $0\mathrm{.}1$ points unless otherwise noted.The first few questions will use the program below. Questions #$1-7$ are in red in the

comments of the code. List the register values after that line executes $($for example, #$1$ is

asking after that Idr r$1,[$r$0]$ executes, what value will be in register $1?).$ You're welcome to

paste the code into uVision and step through it to double check your answers.

AREA RESET, CODE

THUMB

ENTRY

Main

ldr $r0,=$ Fourth

ldr $r1,[r0],$;#$1-r1=0x$

ldrb $22,[r0],$;#$2-r2=0x$

ldr $ro,=$output

strb $r1,[r0,$#$2],$;#$3-r0=0x$

ldr $r1,=$ First

ldr $r2,[r1,$#$4],$;#$4-r2=0x$ and #$5-r1=0x$

strb $r2,[r0]$

ldr $r3,[r1],$#$8,$;#$6-r3=0x$ and #$7-r1=0x$

strb $r3,[r0,$#$3]!$

mov $r1,$#$-3$

strb r$1,[$r$0,$ #$-2]$ ;yes, that's a negative two

b$.$

AREA HW$03,$ DATA

Output space $4$

END